期刊
PHYSICAL REVIEW B
卷 78, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.214505
关键词
band structure; barium compounds; boson systems; electronic density of states; high-temperature superconductors; neodymium compounds; scanning tunnelling spectroscopy; superconductive tunnelling
资金
- Deutsche Forschungsgemeinschaft
We performed scanning tunneling spectroscopic experiments on hole-doped NdBa2Cu3O7-delta. The dI/dV curves obtained at 4.2 K are asymmetric with clear peak, dip, and hump structures. Energy derivatives of these curves show peaks at energies beyond the dip features. Highly precise full potential band-structure calculations confirm a featureless electronic density of states in that energy region. Our results indicate that tunneling electrons couple to a collective mode in the CuO2 plane.
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